Random access method and apparatus, terminal and storage medium

Abstract

The application discloses a random access method and apparatus, a terminal, and a storage medium. The method includes: determining, by a terminal, a random access occasion (RO) time domain position group; and selecting a first RO from the RO time domain position group and calculating a random access radio network temporary identifier (RA-RNTI) of the first RO. The RO time domain position group includes at least one of the following: a transmittable frame number group and a first slot number group, or a second slot number group.

1 . A random access method, comprising:
 determining, by a terminal, a random access occasion (RO) time domain position group; and   selecting a first RO from the RO time domain position group, and calculating a random access radio network temporary identifier (RA-RNTI) of the first RO,   wherein the RO time domain position group comprises at least one of the following:
 a transmittable frame number group and a first slot number group, or 
 a second slot number group,
 wherein the transmittable frame number group is used to indicate a transmittable frame, and the transmittable frame is a radio frame wherein an RO that is used to transmit a preamble is located; 
 the first slot number group is used to indicate a first slot that is based on a first subcarrier spacing and in which the RO is located in the transmittable frame; and 
 the second slot number group is used to indicate a second slot that is based on a second subcarrier spacing and in which the RO is located in the first slot. 
 
   
     
     
         2 . The random access method according to  claim 1 , wherein the first subcarrier spacing or the second subcarrier spacing is related to at least one of the following:
 a subcarrier spacing for sending a physical random access channel (PRACH);   a frequency range for sending a PRACH;   a format for sending a PRACH; or   a sequence length for sending a PRACH.   
     
     
         3 . The random access method according to  claim 1 , wherein the first slot number group is related to at least one of the following:
 a subcarrier spacing for sending a PRACH;   a frequency range for sending a PRACH;   a frequency band characteristic for sending a PRACH;   a format for sending a PRACH;   a sequence length for sending a PRACH;   a PRACH configuration index;   the first subcarrier spacing;   a number L of slots that are based on the first subcarrier spacing and that are contained in each radio frame;   a size M1 of the first slot number group; or   a configuration index of the first slot number group.   
     
     
         4 . The random access method according to  claim 1 , wherein the second slot number group is related to at least one of the following:
 a subcarrier spacing for sending a PRACH;   a frequency range for sending a PRACH;   a frequency band characteristic for sending a PRACH;   a format for sending a PRACH;   a sequence length for sending a PRACH;   a PRACH configuration index;   the first subcarrier spacing;   the second subcarrier spacing;   a number L of slots that are based on the first subcarrier spacing and that are contained in each radio frame;   a ratio N of the second subcarrier spacing to the first subcarrier spacing;   a size M1 of the first slot number group;   a size M2 of the second slot number group;   a configuration index of the first slot number group; or   a configuration index of the second slot number group.   
     
     
         5 . The random access method according to  claim 1 , wherein the determining, by the terminal, the random access occasion (RO) time domain position group comprises:
 obtaining a random access channel (RACH) configuration table according to at least one of the frequency range for sending a physical random access channel (PRACH), the subcarrier spacing of the PRACH, and the frequency band characteristic for sending a PRACH;   searching the RACH configuration table according to a PRACH configuration index indicated by a network, to obtain the transmittable frame number group, the first slot number group, and a size M2 of the second slot number group in which the RO is located; and   determining that the second slot number group is M2 values predefined between 0 and N−1,   wherein N is a ratio of the second subcarrier spacing to the first subcarrier spacing; and   the M2 values of the second slot number group are one or more combinations of M2 values obtained from 0 to N−1.   
     
     
         6 . The random access method according to  claim 5 , wherein that the M2 values of the second slot number group are one or more combinations of M2 values obtained from 0 to N−1 comprises one or more of the following:
 the first M2 values from 0 to N−1; 
 the last M2 values from 0 to N−1; 
 all or a part of X satisfying X mod (rounded up or rounded down value of N/M2)=Y, wherein X is an integer value between 0 and N−1, and Y is one or more predefined values; 
 M2 consecutive values between 0 and N−1; or 
 multiple M2 consecutive values between 0 and N−1. 
 
     
     
         7 . The random access method according to  claim 1 , wherein the calculating the random access radio network temporary identifier (RA-RNTI) of the first RO comprises:
 determining a time domain number corresponding to the first RO; and   calculating a RA-RNTI of the first RO based on the time domain number.   
     
     
         8 . The random access method according to  claim 7 , wherein the time domain number is a third slot number based on a third subcarrier spacing, wherein the third subcarrier spacing is determined by one of the following:
 the third subcarrier spacing is the first subcarrier spacing;   the third subcarrier spacing is the second subcarrier spacing or the subcarrier spacing of the PRACH; or   when the subcarrier spacing of the PRACH satisfies a first condition or belongs to a first set, the third subcarrier spacing is the second subcarrier spacing or the subcarrier spacing of the PRACH; otherwise, the third subcarrier spacing is the first subcarrier spacing or the fourth subcarrier spacing, wherein the fourth subcarrier spacing is a predefined subcarrier spacing.   
     
     
         9 . The random access method according to  claim 7 , wherein
 the time domain number is a sequence number of the first RO that is sorted in sequence in a slot set in which the RO is sent in a transmittable frame, and the slot set in which the RO is sent is obtained based on the first slot number group or the second slot number group; or   the time domain number is a sequence number of the first RO that is sorted in sequence in a group of a slot set in which the RO is sent in a transmittable frame, and the slot set is obtained based on the first slot number group or the second slot number group,   wherein the slot set is grouped according to one of the following:
 R consecutive slot values are a group; or 
 slots separated from each other by R slot values are a group. 
   
     
     
         10 . The random access method according to  claim 7 , wherein the calculating the RA-RNTI of the first RO based on the time domain number comprises:
 calculating the RA-RNTI of the first RO based on the time domain number by using one of the following formulas:
   RA-RNTI=1+ s _id+14× t _id+14× X×f _id+14× X× 8×ul_carrier_id  formula 1; or
 
   RA-RNTI=(1+ s _id+14× t _id+14× X×f _id+14× X× 8×ul_carrier_id)mod  A   formula 2;
 
   wherein X is obtained by one of the following methods:   a size of a slot set in which an RO is sent within a frame;   a size of a group of a slot set in which RO is sent within a frame;   a maximum value of a size of a slot set in which an RO is sent in a configurable frame in a RACH configuration table obtained according to at least one of the frequency range for sending a PRACH, the subcarrier spacing of the PRACH, and the frequency band characteristic for sending a PRACH; or   a maximum value of a size of a group of a slot set in which an RO is sent in a configurable frame in a RACH configuration table obtained according to at least one of the frequency range for sending a PRACH, the subcarrier spacing of the PRACH, and the frequency band characteristic for sending a PRACH,   wherein s_id is a first OFDM symbol index of the first RO;   t_id is a time domain number corresponding to the first RO;   f_id is a frequency domain number corresponding to the first RO;   ul_carrier_id is an uplink carrier used to transmit the preamble, 0 means a normal uplink carrier, and 1 means a supplementary uplink carrier; and   A is a preset integer, or A is configured by a network side, or A is determined by the terminal.   
     
     
         11 . The random access method according to  claim 10 , wherein the size of the slot set in which the RO is transmitted within a frame is a first slot set size or the first slot set size multiplied by a second slot set size. 
     
     
         12 . The random access method according to  claim 10 , further comprising:
 determining, by the terminal according to a size of X, whether it is necessary to determine, based on a first indication of the network, a received random access response (RAR) scheduled by a physical downlink control channel (PDCCH), or determining, by the terminal, a size of the first indication according to a size of X.   
     
     
         13 . The random access method according to  claim 12 , wherein the first indication comprises at least one of the following:
 an ID of a group of the slot set in which the RO is sent within a frame;   an ID of a group of a slot set in which an RO is sent in a configurable frame in a RACH configuration table obtained according to at least one of the frequency range for sending a PRACH, the subcarrier spacing of the PRACH, and the frequency band characteristic for sending a PRACH; or   a rounded up value of (1+s_id+14×t_id+14×X×f_id+14×X×8×ul_carrier_id)/A.   
     
     
         14 . A terminal, comprising:
 a memory storing a computer program; and   a processor coupled to the memory and configured to execute the computer program to perform operations comprising:
 determining a random access occasion (RO) time domain position group; and 
 selecting a first RO from the RO time domain position group, and calculating a random access radio network temporary identifier (RA-RNTI) of the first RO, 
 wherein the RO time domain position group comprises at least one of the following:
 a transmittable frame number group and a first slot number group, or 
 a second slot number group,
 wherein the transmittable frame number group is used to indicate a transmittable frame, and the transmittable frame is a radio frame wherein an RO that is used to transmit a preamble is located; 
 the first slot number group is used to indicate a first slot that is based on a first subcarrier spacing and in which the RO is located in the transmittable frame; and 
 the second slot number group is used to indicate a second slot that is based on a second subcarrier spacing and in which the RO is located in the first slot. 
 
 
   
     
     
         15 . The terminal according to  claim 14 , wherein the second slot number group is related to at least one of the following:
 a subcarrier spacing for sending a PRACH;   a frequency range for sending a PRACH;   a frequency band characteristic for sending a PRACH;   a format for sending a PRACH;   a sequence length for sending a PRACH;   a PRACH configuration index;   the first subcarrier spacing;   the second subcarrier spacing;   a number L of slots that are based on the first subcarrier spacing and that are contained in each radio frame;   a ratio N of the second subcarrier spacing to the first subcarrier spacing;   a size M1 of the first slot number group;   a size M2 of the second slot number group;   a configuration index of the first slot number group; or   a configuration index of the second slot number group.   
     
     
         16 . The terminal according to  claim 14 , wherein the determining the random access occasion (RO) time domain position group comprises:
 obtaining a random access channel (RACH) configuration table according to at least one of the frequency range for sending a physical random access channel (PRACH), the subcarrier spacing of the PRACH, and the frequency band characteristic for sending a PRACH;   searching the RACH configuration table according to a PRACH configuration index indicated by a network, to obtain the transmittable frame number group, the first slot number group, and a size M2 of the second slot number group in which the RO is located; and   determining that the second slot number group is M2 values predefined between 0 and N−1,   wherein N is a ratio of the second subcarrier spacing to the first subcarrier spacing; and   the M2 values of the second slot number group are one or more combinations of M2 values obtained from 0 to N−1.   
     
     
         17 . The terminal according to  claim 14 , wherein the calculating the random access radio network temporary identifier (RA-RNTI) of the first RO comprises:
 determining a time domain number corresponding to the first RO; and   calculating a RA-RNTI of the first RO based on the time domain number.   
     
     
         18 . The terminal according to  claim 17 , wherein the time domain number is a third slot number based on a third subcarrier spacing, wherein the third subcarrier spacing is determined by one of the following:
 the third subcarrier spacing is the first subcarrier spacing;   the third subcarrier spacing is the second subcarrier spacing or the subcarrier spacing of the PRACH; or   when the subcarrier spacing of the PRACH satisfies a first condition or belongs to a first set, the third subcarrier spacing is the second subcarrier spacing or the subcarrier spacing of the PRACH; otherwise, the third subcarrier spacing is the first subcarrier spacing or the fourth subcarrier spacing, wherein the fourth subcarrier spacing is a predefined subcarrier spacing.   
     
     
         19 . The terminal according to  claim 17 , wherein the calculating the RA-RNTI of the first RO based on the time domain number comprises:
 calculating the RA-RNTI of the first RO based on the time domain number by using one of the following formulas:
   RA-RNTI=1+ s _id+14× t _id+14× X×f _id+14× X× 8×ul_carrier_id  formula 1; or
 
   RA-RNTI=(1+ s _id+14× t _id+14× X×f _id+14× X× 8×ul_carrier_id)mod  A   formula 2;
 
   wherein X is obtained by one of the following methods:   a size of a slot set in which an RO is sent within a frame;   a size of a group of a slot set in which RO is sent within a frame;   a maximum value of a size of a slot set in which an RO is sent in a configurable frame in a RACH configuration table obtained according to at least one of the frequency range for sending a PRACH, the subcarrier spacing of the PRACH, and the frequency band characteristic for sending a PRACH; or   a maximum value of a size of a group of a slot set in which an RO is sent in a configurable frame in a RACH configuration table obtained according to at least one of the frequency range for sending a PRACH, the subcarrier spacing of the PRACH, and the frequency band characteristic for sending a PRACH,   wherein s_id is a first OFDM symbol index of the first RO;   t_id is a time domain number corresponding to the first RO;   f_id is a frequency domain number corresponding to the first RO;   ul_carrier_id is an uplink carrier used to transmit the preamble, 0 means a normal uplink carrier, and 1 means a supplementary uplink carrier; and   A is a preset integer, or A is configured by a network side, or A is determined by the terminal.   
     
     
         20 . A non-transitory computer-readable storage medium, storing a computer program, wherein the computer program, when executed by a processor of a terminal, causes the processor to perform operations comprising:
 determining, by the terminal, a random access occasion (RO) time domain position group; and   selecting a first RO from the RO time domain position group, and calculating a random access radio network temporary identifier (RA-RNTI) of the first RO,   wherein the RO time domain position group comprises at least one of the following:
 a transmittable frame number group and a first slot number group, or 
 a second slot number group,
 wherein the transmittable frame number group is used to indicate a transmittable frame, and the transmittable frame is a radio frame wherein an RO that is used to transmit a preamble is located; 
 the first slot number group is used to indicate a first slot that is based on a first subcarrier spacing and in which the RO is located in the transmittable frame; and 
 the second slot number group is used to indicate a second slot that is based on a second subcarrier spacing and in which the RO is located in the first slot.